THE REASON MOST FANTAIL BREEDERS THAT SHOW BIRDS KEEP THEM IN LOFTS WITH NO PERCHES . THE CONSTANT FLYING AROUND CAN CAUSE THE TAIL TO BECOME CONCAVE LIKE YOURS. SOME IS DO TO BREEDING GENICTICS WHERE THEY BREED FLAT TAIL BIRDS ONLY .
That pied brown and white fantail will win some prizes if you ever show him Larrylofts. I am saying this with "NO" experience in showing pigeons what so ever.